Koepsell, Thomas D. Epidemiologic methods : studying the occurrence of illness / Thomas D. Koepsell, Noel S. Weiss - Oxford : Oxford University Press, 2003 - ix, 513 p. : ill., maps ; 24 cm. ISBN: 0195150783 RM313.32 Subjects--Topical Terms: Epidemiology--MethodologyEpidemiologic Methods National Library of Medicine Call No.: WA950